Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 666, Issue -, Pages 184-190Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.04.051
Keywords
Z3CN20-09M CDSSs; Quasi in-situ tensile test; Thermal ageing; Gliding steps; Phase boundary
Categories
Funding
- National Natural Science Foundation of China [51371132]
- Key Laboratory Project of the Education Department of Shaanxi Province [14JS031]
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To clarify the effects of the long-term thermal ageing embrittleness on the deformation and fracture mechanism of casting duplex stainless steels (CDSSs), quasi in-situ tensile tests under OM and SEM are conducted for Z3CN20-09M CDSSs thermally aged up to 10,000 h. Regardless of thermal ageing, the single sliding, multi-gliding and cross-slipping are the main deformation mechanisms in the austenite and ferrite under tensile load. The long-term thermal ageing mainly affects the initiation and the propagation of the cracks and then influences the fracture mechanisms. For the as-received specimen, the cracks initiate in the locations of the impurity particles both within the austenite and ferrite grains and between the delta/gamma phase boundaries. For the spinodal decomposition, the precipitation of the G-phase and the coarsening of the spinodally decomposed structure in ferrite, the cracks mainly originate in the delta/gamma phase boundary and the slip steps in ferrite. The fracture mode changes from the microvoid coalescence ductile fracture of the as-received specimen, to the quasi-cleavage fracture in ageing time of 3000 h and to the cleavage fracture in ferrite and the quasi-cleavage fracture in austenite in ageing time of 10,000 h. (C) 2016 Elsevier B.V. All rights reserved.
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